BioMedical Admissions Test (BMAT) Practice Test 2026 - Free BMAT Practice Questions and Study Guide

The primary function of an ammeter in electrical circuits is to measure the current flowing through a circuit. Ammeters are specifically designed to be placed in series with the component whose current you want to measure. When connected this way, they allow all the current to pass through them, providing an accurate reading of the current flow in amperes (A).

In contrast, other options focus on different electrical measurements. For example, measuring voltage across two points is a function of a voltmeter, which is connected in parallel to the circuit component. Calculating resistance involves using ohmmeters or applying Ohm’s Law (V=IR), requiring the measurement of voltage and current, rather than direct measurement of resistance. Detecting the presence of electric fields is more relevant to devices like field meters or electrostatic voltmeters, not ammeters, which operate based on current flow.